Tools of AstronomyTools of Astronomy

TelescopesTelescopes Most collect and focus Most collect and focus

light.light.

Two types-Two types-

1. optical1. optical

2. radio2. radio

1. Optical Telescopes1. Optical Telescopes Collect light Uses mirrors and lenses to

make objects appear larger and brighter.

2 Types of Optical 2 Types of Optical TelescopesTelescopes

Refracting TelescopeRefracting Telescope

Convex lenses Convex lenses gather light and gather light and focus it in a small focus it in a small area.area.

Used by Galileo in Used by Galileo in 1609.1609.

Reflecting TelescopeReflecting Telescope Light enters the Light enters the

end and reflects end and reflects on mirrors.on mirrors.

Make Make observations observations through eyepiece.through eyepiece.

Used by Isaac Used by Isaac Newton 1668Newton 1668

ObservatoriesObservatories

Large buildings that store large Large buildings that store large optical telescopesoptical telescopes

2. Radio Telescopes2. Radio Telescopes Receives radio waves from objects in space.Receives radio waves from objects in space.

Can be used in all weather and at all times Can be used in all weather and at all times of dayof day

SatellitesSatellites

orbit around Earthorbit around Earth collect information while in spacecollect information while in space Not affected by Earth’s atmosphereNot affected by Earth’s atmosphere

Space Space ProbesProbes

Travel out of Earth’s orbit to collect info Travel out of Earth’s orbit to collect info instruments are based on the goals of instruments are based on the goals of

the “mission”the “mission”

SpectroscopeSpectroscopess separates light of stars into bands of separates light of stars into bands of

color.color. scientists can guess the gases/elements scientists can guess the gases/elements

of the star.of the star.

Reading Assignment-Reading Assignment-

With your tablemate or alone, With your tablemate or alone,

read pages 94-100 J in read pages 94-100 J in

the pink book.the pink book.